Rotary table for automatic sewing machine installations



Oct. 29, 1968 H. SCHOLL ETAL 3,407,759

ROTARY TABLE FOR AUTOMATIC SEWING MACHINE INSTALLATIONS Filed Dec. 12, 1966 4 sheets-sheet 1 FIG.1

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8 11p 19 NE 1/ Patented Oct. 29, 1968 8 Claims. (51. 112-2 ABSTRACT OF THE DISCLOSURE A rotary table in an automatic sewing machine installation having segments displaceable in a radial plane for receiving workpieces to be sewn. Each of the segments is provided with two patterns and two workpiece clamp holders for a left half and a right half of a workpiece carried by two adjacent segments. For the purpose of adapting the installation for workpieces of the same shape, but other sizes, there is provided a central adjusting device for the simultaneous displacement of all the segments in a radial plane and a scale installation gaged according to the sizes of the workpieces.

The invention relates to a rotary table for the radial symmetric receiving of workpiece parts to be sewn and, which are delivered consecutively following the tables rotation to the operational area of processing machines, such as pattern controlled sewing machines and trimming machines, following the rotation of the table by magnetic rollers for engaging with the peripheral edge portions of the patterns.

The object of the invention is to reduce the fitting out time and the relatively high costs of the installation of a plurality of patterns required during a change of a workpiece form of one size to a different size in a patterncontrolled automatic sewing machine.

German Patent 1,065,706 discloses a device for th automatic production of seams in workpieces which are received about the periphery of a rotary table and are displaced along a profile of a tracer-controlled, movably mounted sewing machine mounted on the support of the rotary table, while the rotary table is provided with a Wedge-shaped circular recess in which are suspended the carriers for the workpieces and the patterns.

To change these known automatic sewing machines, which are set for a certain shape and size of a workpiece, to workpieces of the same shape but of dilferent size, it is necessary to remove the carriers from the automats and change the templates and the devices for clamping the workpieces to those corresponding to the desired sizes of workpieces.

US. Patent 3,174,447 discloses a material holder, adjustable for various sizes of a certain shape, for automatically operating, template controlled sewing machines; however this material holder is not suitable for use in sewing automats operated with a rotary table.

The object of the invention is to construct a sewing automat provided with a rotary table in such a manner, that while retaining the same shape of the desired workpiece, it is possible for the operator to change over to variable sizes of workpieces without replacing the patterns and workpiece clamp means in the shortest time and without production expenditure.

This problem is substantially solved, according to the invention, by constructing the rotary table with carriers formed as radially displaceable segments supported on the rotary table, whereby each workpiece which is to be produced is carried by a pair of adjacent segments which are provided with patterns, workpiece clamp and tension means for a right and left half of a workpiece. The patterns determine the path of the seam on. the left half and the right half of the workpiece carried by two adjacent segments. There is further provided a central adjusting device for the simultaneous radial displacement of all segments. For this purpose a block is provided in the middle of the rotary table, in which are received radially arranged guide bars on which are displaceably supported the segments.

The central device comprises a crank disk pivoted in the block, to which are linked key bars, whose free ends are received in pins secured to the segments. The crank disk proper is constructed as a gear wheel mating with a pinion pivoted in the block which is manipulated by an adjusting wrench. There is further provided a scale device calibrated according to the size of the workpieces, which consists of a sheet iron scale secured to a segment and an index dot mark on the block. The upper clamp plates of the workpiece clamp holder are hinged to rocking arms levers which are under the tension of a spring which may be lowered or raised by the levers rotata'bly supported on the segments.

Each of the templates arranged for a. workpiece and a processing machine consists of two parts, while a link is provided at radially displaceable segments for bridging both parts of the template, magnetic rollers being emplaced against said link during the passage from one template to another.

An embodiment example of the invention is illustrated in the drawing and is described below:

In the drawing:

FIG. 1 is a sewing automat of the rotary table according to the invention, shown in side elevation and partly in section;

FIG. 2 is a partial plan view thereof;

FIG. 3 is a partial view of the device from the bottom;

FIG. 4 is a section on line IV-IV of FIG. 2;

FIG. 5 is a section on line VV of FIG. 2 and FIG. 6 is a view in the direction of the arrow A in FIG. 5.

Supported on a support 1 (FIG. 1) of an automatic sewing installation, by means of horizontal link arms 2, 3, freely displaceable in all horizontal directions, are a trimming device 4 and a sewing machine 5. A rotary table 8 is secured to a hollow shaft 6, vertically pivoted in the support 1 and driven by an electromotor 7.

This rotary table 8 (FIG. 3) is provided with four segments 9, 9, 9" and 9'. These are displaceably mounted on guide rods 10 which are inserted in block 11 and are secured therein by screws 12 (FIG. 4). A bush 13 is inserted in the block 11 and is screwed thereto by means of screws 14. A crank disk 15 is pivoted on the bush 13, said crank disk being in the form of a. gear wheel, with which it mates the pinion 16 pivoted in block 11. It can be turned by the operator from above by means of an adjusting wrench.

As may be seen in FIG. 3, crank pins 17 are inserted in the crank disk 15, to which are hinged connecting rods 18, the free ends of which are received in pins 19, which are secured in segments 9 to 9. During the rotation of the crank disk 15, all segments 9 to 9' are equally displaced outwardly in a radial plane into the same distance from the center of the rotary block 11.

The bush 13, connected with the block 11, is secured to the hollow shaft 6 by means of a screw (FIG. 4).

Each segment 2 to 9 (FIG. 2) carries a pair of workpiece clamp holders 21, 22; the workpiece clamp holders 21 serve to receive the right halves 23 and the workpiece clamp holders 22 the left halves 23 of the workpieces 23, which, in the example shown, are shirt collars.

The workpiece clamping holders 21 have a right lower clamp plate 24 and an upper right clamping plate 25; the workpiece clamp holders 22 are provided with a lower left clamping plate 26 and an upper left clamping plate 27. The lower left clamping plates 24, 26 are secured by means of screws 28 to the segments 9 to 9", while the upper clamping plates 25, 27 are pressed against the workpieces 23 by the tension of springs 29 (FIG. 5).

For this purpose the upper clamp plates 25, 27 are linked to the rocker arms 30, which are pivoted in the bearing blocks 31 secured to the segments 9 to 9 and can be lifted by levers 32 extending radially towards the center of the rotary table. These levers 32 are pivoted in the floor stands 33, which are likewise supported on the segments 99' (FIGS. 2 and 5). The one arm 32 of the levers 32 is formed with a longitudinal slot 34, through which is guided bolt 35 received in bearing eyes 36 in the rocker arms 30. Pivoted rollers 27 are received in support parts 38 at the other end of the lever 32 on their arms 32".

A vertically displaceable bar 39 is mounted in the hollow shaft 6, the bar being controlled in an upward and downward direction by means of an air cylinder 40 through a rod 41 (FIG. 1). As shown in FIG. 4, the bar is received in a bearing bush 42 in the hollow shaft 6 and carries on its top portion a semicircular flange 43. When compressed air is let into the air cylinder 40, the flange 43 takes along simultaneously four of these levers 32, downward, over the rollers 37, so that the adjacent workpiece clamp holders 21, 22 are always lifted for emplacing or receiving workpieces 23.

As may be seen in FIGS. 3 and 5, divided patterns 44, 45 are screwed to the segments 9-9 through the intermediary of spacers 46. The driven magnetic rollers 48, 49 for the sewing machine 5 and trimmer device 4 are disposed against the inner contour 47 of the patterns 44, 45 and roll against it.

The patterns 44, 45 are provided with a bar 50 which is secured to a pattern half 44, and serves to bridge both pattern halves to form a guide for the magnetic rollers 48, 49 when segments 9-9' have moved out radially.

A rod-shaped scale 51, secured on the segment 9' (FIG. 2) is calibrated according to the sizes of the workpieces and cooperates with an adjustable marking dot 52 screwed to the block 11.

As shown in FIGS. 5 and 6, the segments 9 to 9" are connected by means of guide bars 53, 54 to prevent the rotation of these segments about the guide bars 10.

The setting of the rotary table for another size may be made with a socket wrench 55 which may be inserted, from above, in the pinion shaft which is provided with a hexagonal recess. By turning the socket wrench and thus the pinion 16 (FIG. 3), all segments 9-9" supported on the guide rods 10 are moved outwardly, simultaneously and to the same extent over the crank disk 15 and the connecting rods 18. The displacement of the segments 9-9" can be preset according to the scale device 51, 52 which is calibrated according to the sizes of workpieces required.

In the moved in position, thus with a setting for the smallest size, of a workpiece, the patterns 44, 45 butt one another with their front surfaces, while in the moved out position of segments 9-9 the patterns move away from one another, so that a free space remains between them. To prevent the magnetic rollers 48, 49 from falling into the intermediate spaces, the rollers 48, 49 run along bars 50 (FIGS. 2 and 5) which serve as a bridging.

The advantages achieved by the invention reside in enabling the operator to reset the sewing automation provided, in the shortest time and without changing parts, to workpieces of the same shape but of different length, when using the sewing automat provided with a rotary table according to the invention.

We claim:

1. A rotary table for automatic sewing machine installations, said installation comprising in combination, a support member, a shaft mounted for vertical rotation on said support member and carrying said rotary table, carriers arranged at the circumference of said rotary table, upper plates secured to the top portion of said carriers for securing workpiece material, patterns mounted on the upper portions of said carriers, a swingable link arm secured to said support member, said arm being adapted for mounting a sewing machine with a sewing machine bed in planar alignment with said upper plates, a magnetic roller secured to said swingable link arm, for engaging with the peripheral edge portion of said patterns, said arm being adapted to align the needle carrying rod of a sewing machine axially with said roller, said carriers formed as segments displaceably supported at said rotary table in a radial plane, each of said segments provided with two workpiece clamp holders for clamping a left half and a right half of a workpiece carried by two adjacent segments, each of said segments provided with two patterns assigned to said workpiece clamp holders and determining the path of the seam on said left half and said right half of said workpiece carried by two adjacent segments.

2. A rotary table according to claim 1, further including a central adjusting device for the simultaneous displacement of all said segments in a radial plane.

3. A rotary table according to claim 1, wherein said rotary table consists of ,a block having guide bars radially arranged on said block, said segments being displaceably supported on said guide bars.

4. A rotary table according to claim 2, wherein said central adjusting device includes crank disc pivoted in said block and provided with crankpins, connecting rods hinged to said crankpins of said crank disc and to pins attached to said segments.

5. A rotary table according to claim 4, wherein said crank disc is formed as a gear wheel for mating with a pinion, and a pinion manipulatable by an adjusting wrench pivoted in said block.

6. A rotary table according to claim 2, wherein said rotary table consists of at block having guide bars radially arranged on said block, and said segments being displaceably supported on said guide bars, said central adjusting device including a crank disc pivoted in said block and provided with crankpins, connecting rods hinged to said crankpins of said crank disc and to pins attached to said segments, said crank disc being formed as a gear wheel for mating with a pinion, a pinion manipulable by an adjusting wrench pivoted in said block, a scale installation calibrated according to the sizes of the workpieces to be sewn, said scale installation having a scale division attached to one of said segments and an index dot mark fastened to said block.

7. A rotary table according to claim 1, wherein said workpiece clamp holders are provided with lower and upper clamping plates, said upper clamping plates being hinged to rocker arms, spring means tensioning said rocker arms, levers pivoted to said segments are provided for lifting and lowering said rocker arms.

8. A rotary table according to claim 1, wherein each of said segments is provided with two patterns assigned to said workpiece clamp holders for determining the path of the seam on said left half and said right half of said workpiece carried by two adjacent segments, and bars for bridging the spaces between two adjacent patterns formed during shifting of said segments outwardly in a radial plane, said bars being adapted for guiding said magnetic roller during its pasasge from one pattern as- 5 6 signed to said workpiece clamp holder on one segment to 2,722,903 11/1955 Larkin 112-2 said pattern assigned to said workpiece clamp holder 3,174,447 3/ 1965 Bond 1122 on the adjacent segment. 3,276,405 10/1966 Scholl 112102 X References Cited 5 1 065 706 g/fg gg g PATENTS s enmany. UNITED STATES PATENTS 290,844 6/1965 Netherlands. 1,575,887 3/1926 Zimmerman 112-2 2,345,104 3/1944 Dittrich 112-2 HERBERT F. ROSS, Primary Examiner 2,688,292 7/1954 Howard 112102 

